x86/amd_nb: Add SMN and Indirect Data Fabric access for AMD Fam17h

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Some devices on Fam17h can only be accessed through the System Management
Network (SMN). The SMN is accessed by a pair of index/data registers in PCI
config space. Add a pair of functions to read from and write to the SMN.

The Data Fabric on Fam17h allows multiple devices to use the same register
space. The registers of a specific device are accessed indirectly using the
device's DF InstanceId. Currently, we only need to read from these devices,
so only define a read function for now.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/1478812257-5424-5-git-send-email-Yazen.Ghannam@amd.com
[ Boris: make __amd_smn_rw() even more compact. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Yazen Ghannam 2016-11-10 15:10:56 -06:00 • committed by Thomas Gleixner

parent b791c6b6a5

commit ddfe43cdc0

2 changed files with 111 additions and 2 deletions

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5

arch/x86/include/asm/amd_nb.h

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108

arch/x86/kernel/amd_nb.c

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